Bromodichloromethane
California Water Service - San Mateo
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 1.52 ppb | 32 | 31 | ND - 4.55 ppb |
2015 | 3.23 ppb | 32 | 31 | ND - 8.02 ppb |
2016 | 3.35 ppb | 32 | 32 | 0.720 ppb - 11.0 ppb |
2017 | 2.37 ppb | 32 | 24 | ND - 4.61 ppb |
2018 | 1.94 ppb | 32 | 31 | ND - 5.23 ppb |
2019 | 1.26 ppb | 32 | 24 | ND - 4.02 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2014-02-05 | 5701-900-1205 | 2.90 ppb |
2014-02-05 | 5701-901-1120 | 1.51 ppb |
2014-02-05 | 5701-902-1105 | 1.43 ppb |
2014-02-05 | 5701-903-0945 | 4.36 ppb |
2014-02-05 | 5701-904-1140 | 1.50 ppb |
2014-02-05 | 5701-905-1000 | 4.55 ppb |
2014-02-05 | 5701-906-1020 | 1.71 ppb |
2014-02-05 | 5701-907-1225 | 3.41 ppb |
2014-05-07 | 5701-900-1515 | 0.840 ppb |
2014-05-07 | 5701-901-1545 | 0.960 ppb |
2014-05-07 | 5701-902-1600 | ND |
2014-05-07 | 5701-903-1540 | 0.840 ppb |
2014-05-07 | 5701-904-1705 | 0.950 ppb |
2014-05-07 | 5701-905-1600 | 0.890 ppb |
2014-05-07 | 5701-906-1434 | 0.900 ppb |
2014-05-07 | 5701-907-1455 | 0.940 ppb |
2014-08-06 | 5701-900-1300 | 1.04 ppb |
2014-08-06 | 5701-901-1100 | 1.12 ppb |
2014-08-06 | 5701-902-1115 | 1.12 ppb |
2014-08-06 | 5701-903-1250 | 0.990 ppb |
2014-08-06 | 5701-904-1025 | 1.11 ppb |
2014-08-06 | 5701-905-1305 | 0.990 ppb |
2014-08-06 | 5701-906-1140 | 1.14 ppb |
2014-08-06 | 5701-907-1355 | 1.01 ppb |
2014-11-03 | 5701-900-1300 | 1.45 ppb |
2014-11-03 | 5701-901-1245 | 1.48 ppb |
2014-11-03 | 5701-902-1230 | 1.61 ppb |
2014-11-03 | 5701-903-1150 | 1.45 ppb |
2014-11-03 | 5701-904-1350 | 1.72 ppb |
2014-11-03 | 5701-905-1125 | 1.44 ppb |
2014-11-03 | 5701-906-1335 | 1.64 ppb |
2014-11-03 | 5701-907-1320 | 1.50 ppb |
2015-02-04 | 5701-900-0850 | 6.90 ppb |
2015-02-04 | 5701-901-0850 | 7.45 ppb |
2015-02-04 | 5701-902-0850 | 7.86 ppb |
2015-02-04 | 5701-903-0850 | 6.17 ppb |
2015-02-04 | 5701-904-0850 | 8.02 ppb |
2015-02-04 | 5701-905-0850 | 6.17 ppb |
2015-02-04 | 5701-906-0850 | 7.73 ppb |
2015-02-04 | 5701-907-0850 | 6.84 ppb |
2015-05-06 | 5701-900-0832 | 0.890 ppb |
2015-05-06 | 5701-901-0832 | 1.03 ppb |
2015-05-06 | 5701-902-0832 | 0.950 ppb |
2015-05-06 | 5701-903-0832 | 0.770 ppb |
2015-05-06 | 5701-904-0832 | 0.970 ppb |
2015-05-06 | 5701-905-0832 | 0.850 ppb |
2015-05-06 | 5701-906-0832 | ND |
2015-05-06 | 5701-907-0832 | 0.940 ppb |
2015-08-04 | 5701-900-0827 | 1.11 ppb |
2015-08-04 | 5701-901-0827 | 1.20 ppb |
2015-08-04 | 5701-902-0827 | 1.25 ppb |
2015-08-04 | 5701-903-0827 | 1.08 ppb |
2015-08-04 | 5701-904-0827 | 1.22 ppb |
2015-08-04 | 5701-905-0827 | 1.09 ppb |
2015-08-04 | 5701-906-0827 | 1.24 ppb |
2015-08-04 | 5701-907-0827 | 1.24 ppb |
2015-11-03 | 5701-900-0818 | 3.37 ppb |
2015-11-03 | 5701-901-0818 | 4.59 ppb |
2015-11-03 | 5701-902-0818 | 4.45 ppb |
2015-11-03 | 5701-903-0818 | 3.39 ppb |
2015-11-03 | 5701-904-0818 | 4.77 ppb |
2015-11-03 | 5701-905-0818 | 3.44 ppb |
2015-11-03 | 5701-906-0818 | 4.73 ppb |
2015-12-09 | 5810-907-0840 | 1.80 ppb |
2016-02-02 | 5701-900-0858 | 8.24 ppb |
2016-02-02 | 5701-901-0858 | 11.0 ppb |
2016-02-02 | 5701-902-0858 | 10.7 ppb |
2016-02-02 | 5701-903-0858 | 6.74 ppb |
2016-02-02 | 5701-904-0858 | 11.0 ppb |
2016-02-02 | 5701-905-0858 | 6.26 ppb |
2016-02-02 | 5701-906-0858 | 10.1 ppb |
2016-02-02 | 5701-907-0858 | 8.74 ppb |
2016-05-02 | 5701-900-0714 | 2.43 ppb |
2016-05-02 | 5701-901-0714 | 2.04 ppb |
2016-05-02 | 5701-902-0714 | 2.14 ppb |
2016-05-02 | 5701-903-0714 | 2.34 ppb |
2016-05-02 | 5701-904-0714 | 2.10 ppb |
2016-05-02 | 5701-905-0714 | 2.33 ppb |
2016-05-02 | 5701-906-0714 | 2.27 ppb |
2016-05-02 | 5701-907-0714 | 2.16 ppb |
2016-08-02 | 5701-900-0856 | 0.720 ppb |
2016-08-02 | 5701-901-0856 | 0.750 ppb |
2016-08-02 | 5701-902-0856 | 0.980 ppb |
2016-08-02 | 5701-903-0856 | 0.750 ppb |
2016-08-02 | 5701-904-0856 | 0.900 ppb |
2016-08-02 | 5701-905-0856 | 0.750 ppb |
2016-08-02 | 5701-906-0856 | 0.970 ppb |
2016-08-02 | 5701-907-0856 | 0.980 ppb |
2016-11-07 | 5701-900-0931 | 1.13 ppb |
2016-11-07 | 5701-901-0931 | 1.30 ppb |
2016-11-07 | 5701-902-0931 | 1.29 ppb |
2016-11-07 | 5701-903-0931 | 1.23 ppb |
2016-11-07 | 5701-904-0931 | 1.35 ppb |
2016-11-07 | 5701-905-0931 | 1.24 ppb |
2016-11-07 | 5701-906-0931 | 1.32 ppb |
2016-11-09 | 5701-907-0844 | 1.21 ppb |
2017-02-06 | 5701-900-0653 | 4.61 ppb |
2017-02-06 | 5701-901-0653 | 3.78 ppb |
2017-02-06 | 5701-902-0653 | 3.77 ppb |
2017-02-06 | 5701-903-0653 | 4.24 ppb |
2017-02-06 | 5701-904-0654 | 3.52 ppb |
2017-02-06 | 5701-905-0654 | 4.32 ppb |
2017-02-06 | 5701-906-0654 | 3.94 ppb |
2017-02-06 | 5701-907-0654 | 3.34 ppb |
2017-05-01 | 5810-900-1510 | 2.40 ppb |
2017-05-01 | 5810-901-1100 | 3.10 ppb |
2017-05-01 | 5810-902-1145 | 3.00 ppb |
2017-05-01 | 5810-903-1440 | 2.20 ppb |
2017-05-01 | 5810-904-1115 | 3.10 ppb |
2017-05-01 | 5810-905-1455 | 2.40 ppb |
2017-05-01 | 5810-906-1030 | 3.10 ppb |
2017-05-01 | 5810-907-1045 | 2.50 ppb |
2017-08-09 | 5810-900-0820 | ND |
2017-08-09 | 5810-901-1140 | ND |
2017-08-09 | 5810-902-1150 | ND |
2017-08-09 | 5810-903-1315 | ND |
2017-08-09 | 5810-904-0740 | ND |
2017-08-09 | 5810-905-1300 | ND |
2017-08-09 | 5810-906-1205 | ND |
2017-08-09 | 5810-907-0900 | ND |
2017-11-08 | 5701-900-0904 | 1.91 ppb |
2017-11-08 | 5701-901-0904 | 3.75 ppb |
2017-11-08 | 5701-902-0904 | 2.85 ppb |
2017-11-08 | 5701-903-0904 | 1.80 ppb |
2017-11-08 | 5701-904-0904 | 3.13 ppb |
2017-11-08 | 5701-905-0904 | 1.95 ppb |
2017-11-08 | 5701-906-0904 | 3.62 ppb |
2017-11-08 | 5701-907-0904 | 3.37 ppb |
2018-02-05 | 5810-900-1250 | 1.000 ppb |
2018-02-05 | 5810-901-1220 | 2.30 ppb |
2018-02-05 | 5810-902-1205 | 2.30 ppb |
2018-02-05 | 5810-903-1020 | 1.000 ppb |
2018-02-05 | 5810-904-1235 | 2.60 ppb |
2018-02-05 | 5810-905-1315 | ND |
2018-02-05 | 5810-906-0935 | 2.40 ppb |
2018-02-05 | 5810-907-0955 | 1.30 ppb |
2018-05-07 | 5701-900-0852 | 1.38 ppb |
2018-05-07 | 5701-901-0852 | 1.61 ppb |
2018-05-07 | 5701-902-0852 | 1.52 ppb |
2018-05-07 | 5701-903-0852 | 1.46 ppb |
2018-05-07 | 5701-904-0852 | 1.60 ppb |
2018-05-07 | 5701-905-0852 | 1.57 ppb |
2018-05-07 | 5701-906-0852 | 1.63 ppb |
2018-05-07 | 5701-907-0852 | 1.47 ppb |
2018-08-06 | 5701-900-0809 | 0.690 ppb |
2018-08-06 | 5701-901-0809 | 0.830 ppb |
2018-08-06 | 5701-902-0809 | 0.880 ppb |
2018-08-06 | 5701-903-0809 | 0.760 ppb |
2018-08-06 | 5701-904-0809 | 0.890 ppb |
2018-08-06 | 5701-905-0809 | 0.810 ppb |
2018-08-06 | 5701-906-0809 | 0.850 ppb |
2018-08-06 | 5701-907-0809 | 0.850 ppb |
2018-11-05 | 5701-900-1021 | 1.95 ppb |
2018-11-05 | 5701-901-1021 | 4.58 ppb |
2018-11-05 | 5701-902-1021 | 4.73 ppb |
2018-11-05 | 5701-903-1021 | 2.65 ppb |
2018-11-05 | 5701-904-1021 | 4.93 ppb |
2018-11-05 | 5701-905-1021 | 3.10 ppb |
2018-11-05 | 5701-906-1021 | 5.23 ppb |
2018-11-05 | 5701-907-1021 | 3.05 ppb |
2019-02-06 | 5701-900-0623 | 3.25 ppb |
2019-02-06 | 5701-901-0623 | 4.02 ppb |
2019-02-06 | 5701-902-0623 | 3.62 ppb |
2019-02-06 | 5701-903-0623 | 2.97 ppb |
2019-02-06 | 5701-904-0623 | 3.27 ppb |
2019-02-06 | 5701-905-0623 | 2.91 ppb |
2019-02-06 | 5701-906-0623 | 3.46 ppb |
2019-02-06 | 5701-907-0623 | 3.33 ppb |
2019-05-07 | 5701-900-0858 | 0.990 ppb |
2019-05-07 | 5701-901-0858 | 1.000 ppb |
2019-05-07 | 5701-902-0858 | 1.000 ppb |
2019-05-07 | 5701-903-0858 | 1.03 ppb |
2019-05-07 | 5701-904-0858 | 1.02 ppb |
2019-05-07 | 5701-905-0858 | 0.990 ppb |
2019-05-07 | 5701-906-0858 | 0.980 ppb |
2019-05-07 | 5701-907-0858 | 1.000 ppb |
2019-08-06 | 5701-900-0820 | 0.640 ppb |
2019-08-06 | 5701-901-1000 | 0.640 ppb |
2019-08-06 | 5701-902-1010 | 0.650 ppb |
2019-08-06 | 5701-903-0745 | 0.700 ppb |
2019-08-06 | 5701-904-0940 | 0.690 ppb |
2019-08-06 | 5701-905-0800 | 0.680 ppb |
2019-08-06 | 5701-906-1030 | 0.740 ppb |
2019-08-06 | 5701-907-0835 | 0.670 ppb |
2019-11-05 | 5701-900-1145 | ND |
2019-11-05 | 5701-901-0915 | ND |
2019-11-05 | 5701-902-0925 | ND |
2019-11-05 | 5701-903-1125 | ND |
2019-11-05 | 5701-904-0855 | ND |
2019-11-05 | 5701-905-1130 | ND |
2019-11-05 | 5701-906-1215 | ND |
2019-11-05 | 5701-907-1200 | ND |